/*******************************************************************************
 * Copyright 2014 United States Government as represented by the
 * Administrator of the National Aeronautics and Space Administration.
 * All Rights Reserved.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package gov.nasa.ensemble.common.time;

import java.text.DateFormat;
import java.text.DecimalFormat;

/**
 * For now, the only job of this superclass is to make it unnecessary
 * for each instance to have a numberFormat.
 * Those turned out to have a noticeable memory footprint when there are many formats.
 */
public abstract class EnsembleDateFormat extends DateFormat {

	protected abstract int getHashCode();
	protected abstract boolean equals(EnsembleDateFormat otherFormat);

	@Override
	public int hashCode() {
		return getHashCode();
	}

	@Override
	public boolean equals(Object otherObject) {
		if (otherObject instanceof EnsembleDateFormat) {
			return equals((EnsembleDateFormat)otherObject);
		} else {
			return false;
		}
	}
	
	@Override
	public Object clone() {
		if (numberFormat==null) {
			numberFormat = new DecimalFormat();
		}
		return super.clone();
	}

}
